.wrap1{
    height: 100%;
    width: 100%;
    // position: relative;
}
.unRelative{
    position: relative;
}
.wrap2{
    height: 100vh;
    width: 100vw;
    position: absolute;
    z-index: 100;
    left: 0;
    right: 0;
    top: 0;
    bottom: 0;
}
.button{
    position: absolute;
    z-index: 100;
    // height: 100px;
    // width: 100px;
    right: 20px;
    bottom: 20px;
    cursor: pointer;
}
.nImg{
    overflow: hidden;
    img{
        width: 100%;
        height: 100%;
    }
}